I always re-use yeast anyway by doing a second brew from the trub of the first. But there's loads of trub from that first brew so I could easily do 3 or 4 brews from it if I was so inclined.
And I'm a real tight-wad anyway as I even re-use crown caps...
Ale, ale, glorious ale,
Served up in pewter it tells it's own tale.
Some folks likes radishes,
Some curl-eye kale,
But give I boiled parsnips
And a girt dish o taters
And a pint of good ale.